Factor $\frac{7 a b}{x}+\frac{a^{2} b}{x^{2}}-\frac{8 a b^{2}}{x^{3}}$ And Check Your Results

Factor $\frac{7 a b}{x}+\frac{a^{2} b}{x^{2}}-\frac{8 a b^{2}}{x^{3}}$ and check your results.